Mamaw,
There is a big problem here....
Without any detail, nobody can honestly answer your question.
The easy and possible wrong answer would be that most are supposed to do that.
But,
Are we talking about a powered or a towable?
In most (note I said most) self powered RVs, this is an included feature.
In many (but not all) towables, the feature is available but there is no certainly that it has been enabled.
So, if you were to come back and tell us more (maybe a lot more), then there is a very good chance that you can get an accurate answer.
Matt